Buggy code:
public ClassInstanceCreation convert ( AnonymousLocalTypeDeclaration expression ) { } private void buildBodyDeclarations ( AnonymousLocalTypeDeclaration expression , AnonymousClassDeclaration anonymousClassDeclaration ) { } public ArrayCreation convert ( ArrayAllocationExpression expression ) { } public SingleVariableDeclaration convert ( Argument argument ) { } public ArrayInitializer convert ( org . eclipse . jdt . internal . compiler . ast . ArrayInitializer expression ) { } public Expression convert ( QualifiedAllocationExpression expression ) { } public Assignment convert ( org . eclipse . jdt . internal . compiler . ast . Assignment expression ) { } public Assignment convert ( CompoundAssignment expression ) { } public PrefixExpression convert ( org . eclipse . jdt . internal . compiler . ast . PrefixExpression expression ) { } public PostfixExpression convert ( org . eclipse . jdt . internal . compiler . ast . PostfixExpression expression ) { } public CastExpression convert ( org . eclipse . jdt . internal . compiler . ast . CastExpression expression ) { } public Type convertToType ( NameReference reference ) { } public Expression convert ( ClassLiteralAccess expression ) { } public BooleanLiteral convert ( FalseLiteral expression ) { } public BooleanLiteral convert ( TrueLiteral expression ) { } public NullLiteral convert ( org . eclipse . jdt . internal . compiler . ast . NullLiteral expression ) { } public CharacterLiteral convert ( CharLiteral expression ) { } public NumberLiteral convert ( DoubleLiteral expression ) { } public NumberLiteral convert ( FloatLiteral expression ) { } public NumberLiteral convert ( IntLiteral expression ) { } public NumberLiteral convert ( IntLiteralMinValue expression ) { } public NumberLiteral convert ( LongLiteral expression ) { } public NumberLiteral convert ( LongLiteralMinValue expression ) { } public StringLiteral convert ( org . eclipse . jdt . internal . compiler . ast . StringLiteral expression ) { } public StringLiteral convert ( ExtendedStringLiteral expression ) { } public Expression convert ( BinaryExpression expression ) { } public PrefixExpression convert ( UnaryExpression expression ) { } public InstanceofExpression convert ( InstanceOfExpression expression ) { } public ConditionalExpression convert ( org . eclipse . jdt . internal . compiler . ast . ConditionalExpression expression ) { } public Expression convert ( MessageSend expression ) { } public Expression convert ( AND_AND_Expression expression ) { } public Expression convert ( EqualExpression expression ) { } public Expression convert ( OR_OR_Expression expression ) { } public Statement convert ( Statement statement ) { } public AssertStatement convert ( org . eclipse . jdt . internal . compiler . ast . AssertStatement statement ) { } public Block convert ( org . eclipse . jdt . internal . compiler . ast . Block statement ) { } public BreakStatement convert ( org . eclipse . jdt . internal . compiler . ast . BreakStatement statement ) { } public ContinueStatement convert ( org . eclipse . jdt . internal . compiler . ast . ContinueStatement statement ) { } public SwitchCase convert ( CaseStatement statement ) { } public DoStatement convert ( org . eclipse . jdt . internal . compiler . ast . DoStatement statement ) { } public EmptyStatement convert ( org . eclipse . jdt . internal . compiler . ast . EmptyStatement statement ) { } public Statement convert ( ExplicitConstructorCall statement ) { } public ForStatement convert ( org . eclipse . jdt . internal . compiler . ast . ForStatement statement ) { } public Expression convertToExpression ( Statement statement ) { } public IfStatement convert ( org . eclipse . jdt . internal . compiler . ast . IfStatement statement ) { } public LabeledStatement convert ( org . eclipse . jdt . internal . compiler . ast . LabeledStatement statement ) { } public ReturnStatement convert ( org . eclipse . jdt . internal . compiler . ast . ReturnStatement statement ) { } public SwitchStatement convert ( org . eclipse . jdt . internal . compiler . ast . SwitchStatement statement ) { SwitchStatement switchStatement = this . ast . newSwitchStatement ( ) ; switchStatement . setSourceRange ( statement . sourceStart , ( ( ( statement . sourceEnd ) - ( statement . sourceStart ) ) + 1 ) ) ; <START_BUG> switchStatement . setExpression ( convert ( statement . testExpression ) ) ; <END_BUG> Statement [ ] statements = statement . statements ; if ( statements != null ) { int statementsLength = statements . length ; for ( int i = 0 ; i < statementsLength ; i ++ ) { switchStatement . statements ( ) . add ( convert ( statements [ i ] ) ) ; } } return switchStatement ; } public SynchronizedStatement convert ( org . eclipse . jdt . internal . compiler . ast . SynchronizedStatement statement ) { } public ThrowStatement convert ( org . eclipse . jdt . internal . compiler . ast . ThrowStatement statement ) { } public TryStatement convert ( org . eclipse . jdt . internal . compiler . ast . TryStatement statement ) { } public WhileStatement convert ( org . eclipse . jdt . internal . compiler . ast . WhileStatement statement ) { } private boolean isPrimitiveType ( char [ ] name ) { } private PrimitiveType . Code getPrimitiveTypeCode ( char [ ] name ) { } private void retrieveSemiColonPosition ( ASTNode node ) { } private void retrieveColonPosition ( ASTNode node ) { } private int retrieveEndingSemiColonPosition ( int start , int end ) { } private int retrieveExtraDimension ( int start , int end ) { } private int retrieveEndOfDimensionsPosition ( int start , int end ) { } private int retrieveStartingCatchPosition ( int start , int end ) { } private int retrieveEndOfElementTypeNamePosition ( int start , int end ) { } private int retrieveRightBracketPosition ( int start , int end ) { } private int retrieveEndOfRightParenthesisPosition ( int start , int end ) { } private int retrieveProperRightBracketPosition ( int bracketNumber , int start , int end ) { }

Fix:
switchStatement . setExpression ( convert ( statement . expression ) ) ;